Battery is dead need to jump start it - 2004 BMW 7 Series

When Connecting jump leads ALWAYS Positive first, (Red), Negative last, (Black).
When Removing jump leads ALWAYS Negative first, (Black) and Positive last, (Red).
ALWAYS make sure you DON'T touch the negative to the positive at any time! (Loads of sparks and you risk damaging the battery).
Safest way I have found is this.
With the engine on BOTH vehicles turned OFF. Connect up to the flat battery first, then connect to the good battery. ONLY start the vehicle with the good battery. Wait 2 or 3 minutes to let some charge cross to the dead battery then start the vehicle with the dead battery.
The dead battery will need to be fully charged as soon as possible.

double posted, why?
JUMPS OK
AFTER JUMP WORKS AND DRIVING, AND STOP AND KEY OFF
IT WILL NOT CRANK.
did i guess right?
that means ,
check all fuses first. even the alt fuse (large)
1-battery bad? #1 top failure all cars.
2-Charge system bad. (is the charge/ batt warn lamp glowing when running car, bingo.????

3-or phantom drains. (if no crank just after stall then it not this) if drains while sleeping yes.

the tests are easy, a dirt cheap voltmeter
13.3v to 15v running is good charge system.
if 12v and falling not.

if the battery is bad, the charge system can shut down, so, the best practice is to try a know
good battery out of 2nd car, do you have battery to barrow, this is TOP CHOICE< not thinner wallet.

if the good battery fails then the charge system is failing (note I said system and not a part)
or the belt missing or slipping to the alternator.

btw the 4.3L PCM runs the alternator
PCM is engine brain.
btww, same true 2.2l engine.
the regulator is in the PCM.

so is the charge/bat lamp in cluster
on key on, lamp test
the jump start it , it runs
does the charge./batt.lamp go out.
id be all over that lamp, costs nothing to look.

place the positive lead from the jump battery to the positive terminal of the dead battery. take the negative lead from the jump battery and place it on the engine or other metal point--- NOT TO THE NEGATIVE TERMINAL OF THE BATTERY-- If you do then you run a real risk of a power surge that will fry the ECM
However with a dead battery if the cells are failed then the power from the jump battery will probably feed the dead short in the dead battery and it may not work
Best have a load test done on the dead battery to see if it is faulty (cold weather) or just flat

Dangerous practice to try & jump a near dead battery

Always try charging a battery, that is only a couple years
old & not run down more than two or three times

If the battery is dead & reads less than 12 volts, have a parts
store test it or just replace it.

Jumping a cars battery is not a fix for anything,so I fail to
see how your lost & have not addressed the battery issue,
so you can continue on with other testing,if needed

I would say you never checked to see if the battery is any good

I most likely is dead or below 12.6 volts & you never jump a dead
battery,you try charging it

Jumping is not charging a battery,you need to own a battery charger

If the battery keeps draining or won't hold a charge you need
a new one,then if the problem exists you have someone do a
Parasitic Current Test to find out which circuit is staying on

I had the same problem on my jeep, clean and tighten the battery posts an d terminals. I did the that and it stopped.

Need more info - How old is battery? can you jump start? etc. If you can jump start it, take it to a local parts store like Autozone, Advance, etc and have them test your charging system and battery. Note if battery went dead, you're going to need your code to re-activate your factory radio.

The cold air is not related to the battery trouble.

I order for your car to MAKE electricity, there must be some power in the battery. If your battery is dead, when you jump it, you can run the starter motor but if you dont put electricity back into the battery, the alternator will not make power. And ... you have the blower on consuming any power that might be remaining in the poor battery.

You might need a new battery and you might need a new alternator in your 15 year old Park Avenue.

Thank your for your interest in FixYa.com

Probably the battery. Take it the chain auto parts place and they will test it for you.

Some German cars have anti-theft device inside to make it useless to steal...check at the dealership to see if jumping the battery will activate this(the car thinks its being stolen) .